Mark argued at the United States Supreme Court, a rarity for an attorney given that the court hears less than 70 cases a year of more than 10,000 filed. Mark argued on behalf of Henry Montgomery, asking the court to rule its decision in Miller v. Alabama retroactive. A retroactive decision would give Henry an opportunity to be resentenced and the chance of sentence lesser than mandatory life in prison which the court in Miller said is unconstitutional.

Mark’s appearance before the court gained worldwide attention. Check out these links.